LQ9 swap with idle issues

[K30Blazer]

I have my LQ9 in the blazer and it is running well. Sort of. It idles great in Park but hunts in N and revs higher and higher in gear.

I have the gear selector switch down on the trans and the #9 light green wire comes out of that and up to the Blue #34 pinout on the PCM. I also grounded the switch using the Black and White wire that is on the selector.

It seems to do the same thing everytime.

Startup is high idle followed immediately with low idle PERFECT!

R is high idle immediately

N is high idle followed by good idle for two seconds, then high idle. But not as high as gears

Gears are all high idle (I would guess 3k rpm)

I am guessing I don't have an air leak as the idle in Park wouldn't be correct either.

I have a tune from 208 motorsports and he is helping me out. I can't find my scanner so I can't scan it right now, but I am looking for things I can start troubleshooting at.

I connected up the Brake Switch Wire from the harness today, but it seems that all of the changes I have made today (gear selector, wire to PCM and Ground) have done nothing.

Any help would be appreciated.

 

[Russell]

Do you have your check engine light on? Or is it clear?

I'd check and make very sure that all your grounds are secure and hooked up to clean surfaces. Beyond that, you'll need to get a scanner hooked up to it so you can see what is going on. I somewhat doubt that this is going to be an issue with your P/N indication.

 

[K30Blazer]

Well I am an idiot. I have t hooked up the cel yet but I am sure it is on.

I don't have a driveshaft in yet. Waiting on it from HAD. Talked to 208 motorsports and duh, with no resistance the output shaft will spin, the truck will sense the speed through the vss and feed it more fuel driving up the idle.

Will install driveshaft when it arrives and check again but short version is I am an idiot

 

[tRustyK5]

embarrassing, but at least an easy fix...

Done many similar things, it's just part of it.